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Materials Science in Additive Manufacturing Y O influence in heat-treated LPBF IN718 composite
2 3

A

B C D

Figure 10. Scanning electron microscopy image showing precipitates (yellow arrows) present in the microstructure of sample 1075-Y (A). Line scan EDX
(B–D) analysis showing the variation of chemical compositions (wt.%) across different precipitates in sample 1075-Y.

them. As Y O has a high tendency to combine with Ti, state of Y in the matrix in the as-printed sample. When the
2
3
these elements are often found together in the Laves as-printed sample is subjected to solutionizing treatment,
phase. Second, the appearance of numerous nano-sized the element Y is released, forming the observed nano-sized
Y-Ti-O precipitates with diameters <100 nm suggests that precipitates. Moreover, the absence of N in the complex
those precipitates were formed during the solutionizing precipitates when they are not embedded inside the
treatment. Shi et al. observed a similar phenomenon in Laves phase particle prevents the NbC shell from forming
[34]
heat-treated Zr-containing ODS-FeCrAl in which nano- properly due to the lack of a favorable TiN nucleation site.
sized Y-Al-O precipitates were formed during solutionizing Thus, the size of the complex precipitate is significantly
treatment. The authors attributed this to the supersaturated smaller.

Volume 1 Issue 4 (2022) 8 https://doi.org/10.18063/msam.v1i4.25